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How do you use a pointer to a function ?

The hardest part about using a pointer-to-function is declaring it.
Consider an example. You want to create a pointer, pf, that points to the strcmp() function.

The strcmp() function is declared in this way:
int strcmp(const char *, const char * )

To set up pf to point to the strcmp() function, you want a declaration that looks just like the strcmp() function’s declaration, but that has *pf rather than strcmp:
int (*pf)( const char *, const char * );

After you’ve gotten the declaration of pf, you can #include and assign the address of strcmp() to pf: pf = strcmp;

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